Revert "DROPME: keep inherited GIT_TR2 env vars when running test suite"

This reverts commit a495882.

Author: jeffhostetler

t/test-lib.sh

@@ -146,7 +146,6 @@ unset VISUAL EMAIL LANGUAGE COLUMNS $(env | sed -n \
 	-e '/^GIT_PERF_/d' \
 	-e '/^GIT_CURL_VERBOSE/d' \
 	-e '/^GIT_TRACE_CURL/d' \
-	-e '/^GIT_TR2_*/d' \
 	-e 's/^\(GIT_[^=]*\)=.*/\1/p')
 unset XDG_CACHE_HOME
 unset XDG_CONFIG_HOME